Why should one use Objects.requireNonNull()?

Question

I have noted that many Java 8 methods in Oracle JDK use Objects.requireNonNull(), which internally throws NullPointerException if the given object

Answer 1

As a side note, this fail fast before Object#requireNotNull was implemented slightly different before java-9 inside some of the jre classes themselves. Suppose the case :

 Consumer consumer = System.out::println;

In java-8 this compiles as (only the relevant parts)

getstatic Field java/lang/System.out
invokevirtual java/lang/Object.getClass

Basically an operation as : yourReference.getClass - which would fail if yourRefercence is null.

Things have changed in jdk-9 where the same code compiles as

getstatic Field java/lang/System.out
invokestatic java/util/Objects.requireNonNull

Or basically Objects.requireNotNull (yourReference)